JP2883603B1 - Recording medium playback device - Google Patents

Abstract

Abstract: PROBLEM TO BE SOLVED: To provide a disk player equipped with an anti-seismic memory and capable of exchanging a disk without interruption of sound and continuous reproduction using the anti-seismic memory, when a disk is exchanged during reproduction of a disk, promptly. Start playback of the replaced disc. SOLUTION: When a user exchanges a disk during reproduction of a disk, audio output of the next disk is performed without waiting for completion of audio output of the disk before the exchange, and the disk is exchanged after reaching the end of the disk. In this case, the audio output of the next disk is performed after the audio output of the disk before replacement is completed. In the middle of a disc, the user wants to listen to the next disc faster than the currently playing disc.On the other hand, if the user does not change the disc to the end of the disc, This is a case where the user wants to listen to the disc to the end. According to the present invention, appropriate reproduction processing can be performed in accordance with these cases.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk reproducing apparatus such as a CD (compact disk) player, and more particularly to an apparatus in which reproduced sound is not interrupted even when a disk is exchanged.

[0002]

2. Description of the Related Art Conventionally, as a disk reproducing apparatus for preventing a track jump from occurring due to a vibration or the like at the time of reproducing a disk and causing a sound jump, for example, Japanese Patent Publication No. 5-859.
No. 80 (G11B20 / 10) is known. The apparatus disclosed in the above publication comprises a rotating means for rotating a disk in which a digitized information data and a time code based on a recording start end of the information data are recorded in a spiral or concentric manner with a recording track. A disc reproducing apparatus having information reading means for reading information from the disc, a storage means for storing information data obtained by the information reading means in a predetermined address order, and a time code obtained by the information reading means. Detecting means for detecting continuity, and moving the information reading means to a reading position on the disk before the discontinuity of the time code by the detecting means; Until the information reading means moves to the upper reading position, Write address for the controls so as not proceed, information data according to a predetermined address order from the storage unit, is a disk reproducing apparatus characterized by having a control means for controlling to read out at regular time intervals.

Recently, portable CDs for portable use have been developed.
Many players have the above-mentioned earthquake-resistant function. In such players,
The disc is played back at twice the normal speed, and digital audio data is stored in the memory as storage means. When the memory is full, writing to the memory is not performed, and playback from the memory continues. When the amount of data stored in the memory becomes equal to or less than a predetermined amount, writing to the memory is performed again, thereby causing a track jump due to vibration or the like to stop writing to the memory, and causing the data in the memory to stop. Even if the number of tracks jumps, the memory is filled with data in a short period of time, and a device is devised so that sound skipping can be prevented even with repeated track jumps.

[0004] Further, as a disk reproducing apparatus configured to prevent sound interruption at the time of disk exchange, there is, for example, Japanese Patent Application Laid-Open No. 9-69263 (G11B20 / 10). The apparatus disclosed in this publication takes out a disk from a disk magazine by exchanging a disk, reads an information signal recorded on the disk together with address information, and temporarily stores the read information signal in a memory.
The memory is controlled so that the writing speed is faster than the reading speed.

[0005] During the exchange of the disk, the data digital data written in the memory is read out, and during that time, the reproduced sound is attenuated or faded out. Thus, the reproduction output signal can be continuously reproduced without interruption during the exchange operation, and the user can confirm that the disc has been exchanged.

[0006]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. 9-6 / 1997
The technique for preventing sound interruption at the time of disc replacement as disclosed in Japanese Patent No. 9263 cannot be directly applied to a device such as a portable CD player which does not have a magazine for accommodating a plurality of discs. That is, in the portable CD player, the user must change the disk by himself, and in such a device, the user cannot determine when to change the disk.

Accordingly, the present invention provides a CD player having a function for preventing sound skipping as described above and having no means for accommodating a plurality of discs. It is an object of the present invention to provide a device capable of exchanging a disk without interruption of sound every time reading of a disk is completed, and notifying a timing of exchanging a disk.

[0008]

According to the present invention, there is provided a signal reading / reproducing means for reading signals from a recording medium on which a plurality of programs are recorded as digital audio signals and demodulating the signals into digital audio data. A recording medium reproducing apparatus comprising: storage means for temporarily storing digital audio data output from the signal reading / reproducing means; and signal conversion means for converting digital audio data output from the storage means to an analog audio signal. If the recording medium is exchanged before the completion of the reading of the signal from the recording medium, the digital audio data of the recording medium before the exchange remaining in the storage means is discarded and the data of the recording medium after the exchange is stored. After the signal has been read from the recording medium, the recording medium is exchanged. A recording medium reproducing apparatus provided with control means for accumulating digital audio data of the recording medium after replacement, following the digital audio data of the recording medium before replacement remaining in the storage means in the case of It is.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the structure of a disk reproducing apparatus according to the present invention. In FIG. 1, reference numeral 1 denotes a disk, which is usually a plurality of music programs (tracks).
Is recorded.

An optical pickup 2 converts pit data read from the disk 1 into an electric signal. An RF amplifier circuit converts pit data from the optical pickup 2 into a digital signal and generates a servo signal.
Reference numeral 4 denotes a digital signal processing circuit for performing processing such as error correction on the digital signal output from the RF amplifier 3, reference numeral 5 denotes a memory for temporarily storing data processed by the digital signal processing circuit 4, 6 is memory 5
Is a D / A conversion circuit for converting a digital signal read out from a digital signal into an original analog signal.

The memory 5 is composed of a DRAM, and has a capacity of 16 Mbits, and can store data of about 40 seconds when the number of sampling bits is 4 bits and about 20 seconds when the number of sampling bits is 8 bits. it can. The analog signal output from the D / A conversion circuit 6 is configured to be guided to a subsequent amplification circuit (not shown).

A feed motor 8 reciprocates the optical pickup 2 between the inner circumference and the outer circumference of the disk 1. The feed motor 8 is controlled via a servo control circuit 10 by a tracking error signal output from the RF amplifier circuit 3. Is done. Reference numeral 7 denotes a spindle motor for rotating the disk 1.

Reference numeral 11 denotes a system control circuit for controlling the entire CD player. The system control circuit 13 shifts to a mode (not shown) such as reproduction, fast-forward, and fast-reverse, and a control key group 13.
The digital signal processing circuit 4 and the servo control circuit 10 control the digital signal processing circuit 4 and the servo control circuit 10.

Further, 9 is a memory control circuit for controlling writing / stopping of data in the memory 5, 12 is a notification sound generating circuit, 14 is the total number of songs on the disk, the total playing time, the currently playing song (track). ) Is a display section for displaying the number and the elapsed playing time. The display unit includes a liquid crystal display device and a backlight for improving the visibility of the liquid crystal display.

Next, the operation of the apparatus of the present invention will be described in detail with reference to the flowchart of FIG.

First, reproduction of a disc is instructed by a user's operation (S1). The data reproduced from the disc is stored in the memory 5, and when the data reaches a certain amount, the data is sequentially converted into an analog signal by the D / A conversion circuit 6, guided to the amplifier circuit, and emitted through headphones or speakers. You. For normal playback operation and control for preventing sound from being interrupted by vibration (seismic function), etc.
This is as already described in the related art, and the detailed description is omitted here.

Next, it is checked whether the STOP button has been pressed (S2). If the STOP button has not been pressed, it is further checked whether the reading of the disk has reached the end of the disk (S4). Here, when the reading of the disk has not reached the end of the disk, it is determined whether or not the lid (which is a lid that covers the mounting portion of the disk, and the disk is replaced while the lid is open) is opened. Is confirmed (S4), and if the lid is opened, the value of the variable CHECK-FLAG is set to 0 (S6). On the other hand, in S3, when the reading of the disk reaches the end of the disk, the variable CHEC
The value of K-FLAG is set to 1 and a notification sound is generated by the notification sound generation circuit 12 to make the user aware that the disk can be replaced (S5).

When the setting of the variables is completed, the system control circuit 11 stops the rotation of the disk and ends the reading of the disk (S7). Then, it is confirmed whether or not the sound output based on the data remaining in the memory 5 has been completed (S8). If the sound output is still continuing,
Next, it is checked whether the STOP button has been pressed (S9), and it is checked whether the lid has been closed (S10). If the lid has been closed,
Further, it is checked whether a disk exists (S11).

Then, the value of the variable CHECK-FLAG is checked (S12). That is, if the disk is exchanged in the middle of the disk, the variable CHECK-FLAG
Is 0, and the value of the variable CHECK-FLAG is 1 if the disk is exchanged after reaching the end of the disk. Here, if the value of the variable CHECK-FLAG is 0, data storage on the replaced disk is started in place of the data stored (remaining) in the memory 5 (S19), and the data is stored in the memory 5 to some extent. The voice output is started immediately after the accumulation (S20). Thus, when the user exchanges the disk in the middle of the disk, the reproduction of the disk after the exchange is performed without waiting for the end of the sound output by the data of the disk before the exchange.

In step S12, the variable CHEC
If the value of K-FLAG is 1, data storage on the disk after replacement is started (S13), but until the sound output by the data on the disk before replacement already stored in the memory 5 is completed. , The loop processing from S8 to S13 continues. Although the process returns to S13 by the loop process, the second and subsequent processes continue to accumulate data, and do not re-accumulate data from the beginning of the disc. In this way, if the user exchanges the disk after reaching the end of the disk, wait until the audio output based on the data of the disk before the exchange is completed, and then exchange after the audio output based on the data of the disk before the exchange is completed. The subsequent playback (audio output) of the disc is performed.

On the other hand, if the audio output has already been completed in S8, the system control circuit 11
Is displayed on the screen (S14). Then, if the STOP button is pressed by the user, the continuous reproduction process of the disc ends, but if the STOP button is not pressed (S1).
5) Next, it is confirmed whether or not the lid is closed (disc has been replaced) (S16). Here, if the lid is not yet closed, wait for 10 seconds (S17),
If it is not detected that the lid is closed during the 10 seconds, the reproduction is terminated.

However, when the lid is detected to be closed in S16, it is checked whether or not a disc is present (S18). If there is no disc, the reproduction process is terminated. The reproduction (reading) of the newly mounted disk is started to start storing in the memory 5 (S19), and when the data in the memory 5 reaches a certain amount, the sound output is started (S20).

The end of the disk is detected by the system control circuit 11 detecting the data of the track AA in the sub-code obtained by the digital signal processing circuit 4, whereby no more tracks exist. After the completion of the audio output in the memory, it is checked whether or not the disk has been replaced within a predetermined time (10 seconds as described above).

Further, depending on the disc, since the playing time of the program is long, only one program is recorded on one disc (in one disc,
Except for the TOC of track 00, the data track is 1
There is a case where there is only one) or a program other than music, such as English conversation, may be recorded, but it goes without saying that the same function can be applied to such a disc.

[0026]

As described above in detail, according to the present invention, signal reading / reproducing means for reading signals from a recording medium on which a plurality of programs are recorded as digital audio signals and demodulating the signals into digital audio data; A recording medium reproducing apparatus comprising: a storage unit for temporarily storing digital audio data output from a read / reproduction unit; and a signal conversion unit for converting the digital audio data output from the storage unit to an analog audio signal. If the exchange of the recording medium is performed before the completion of the reading of the signal from the storage medium, the digital audio data of the recording medium before the exchange remaining in the storage means is discarded and the data of the recording medium after the exchange is accumulated, If the recording medium is replaced after the completion of reading the signal from the recording medium, Since the control means for storing the digital audio data of the recording medium after the replacement after the digital audio data of the recording medium before the replacement remaining in the means is provided, when the user changes the disk during the reproduction of the disk. The audio output of the next disk is performed without waiting for the completion of the audio output of the disk before replacement.If the disk is replaced after the end of the disk has been reached, the audio output of the disk before replacement is completed. After that, the audio output of the next disk is performed.

That is, the replacement of a disk in the middle is a case where the user wants to listen to the next disk faster than the disk currently being reproduced. Is a case where the user wants to listen to the currently reproduced disc to the end. According to the present invention, it is possible to perform an appropriate reproducing process in accordance with these cases.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram showing a configuration of a recording medium reproducing device of the present invention.

FIG. 2 is a flowchart showing the operation of the recording medium reproducing device of the present invention.

[Explanation of symbols]

 Reference Signs List 1 disc 2 optical pickup 3 RF amplifier circuit 4 digital signal processing circuit 5 memory 6 D / A conversion circuit 7 spindle motor 8 feed motor 9 memory control circuit 10 servo control circuit 11 system control circuit 12 notification sound generation circuit 13 operation key group 14 Display

Continuing on the front page (72) Inventor Katsuyuki Matsumoto 1-1 Sanyocho, Daito-shi, Osaka Inside Sanyo Techno Sound Co., Ltd. (72) Inventor Hitoshi Miyamoto 1-1-1, Sanyocho, Daito-shi, Osaka Sanyo Techno ・Inside Sound Co., Ltd. (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 20/10 321

Claims (1)

(57) [Claims] 1. A signal reading and reproducing means for reading signals from a recording medium in which a plurality of programs are recorded as digital audio signals and demodulating the signals into digital audio data, and temporarily storing digital audio data output from the signal reading and reproducing means. Recording medium reproducing device comprising a storage means for performing the conversion of the digital audio data output from the storage means into an analog audio signal, the recording medium being replaced before the completion of reading the signal from the recording medium. In this case, the digital audio data of the recording medium before the exchange remaining in the storage means is discarded, the data of the recording medium after the exchange is stored, and the exchange of the recording medium is performed after the completion of reading the signal from the recording medium. The recording medium before replacement remaining in the storage means when the Recording medium reproducing apparatus characterized by comprising a control means for storing digital audio data of the recording medium after exchange continues into digital audio data.